posokanei-mcp

Unofficial read-only MCP server for supermarket product and price data from PosoKanei.

This server lets MCP-compatible clients ask questions such as:

• Search for supermarket products by name.
• Look up a product by barcode.
• Compare current retailer prices for a product.
• Compare a small shopping basket across retailers.
• Browse product categories and retailers.

Status

Early open-source version. The implementation uses public, undocumented endpoints used by the PosoKanei web app. Keep requests modest and cache-friendly.

This project is not affiliated with, endorsed by, or operated by PosoKanei, gov.gr, or any Greek public authority.

Installation

Add it to your MCP client configuration:

{
  "mcpServers": {
    "posokanei": {
      "command": "npx",
      "args": ["-y", "posokanei-mcp"]
    }
  }
}

For local development:

{
  "mcpServers": {
    "posokanei": {
      "command": "node",
      "args": ["/absolute/path/to/posokanei-mcp/dist/index.js"]
    }
  }
}

Build first:

npm install
npm run build

Tools

Tool	Purpose
search_products	Search products by text.
get_product	Get details and retailer prices for a product id.
lookup_barcode	Find product prices by EAN/GTIN barcode.
list_products_by_category	List category products, sorted by unit price by default.
list_categories	Return a simplified category tree.
list_retailers	List known retailers.
get_price_history	Fetch product detail with history when available.
compare_competitors	Fetch comparable/competitor product data when available.
compare_basket	Compare a small basket across retailers.
get_stats	Return high-level dataset stats.

Configuration

Optional environment variables:

Variable	Default	Purpose
POSOKANEI_API_BASE	https://api.posokanei.gov.gr	API base URL.
POSOKANEI_CACHE_TTL_MS	300000	In-memory cache TTL.
POSOKANEI_MIN_INTERVAL_MS	250	Minimum delay between outbound API requests.
POSOKANEI_TIMEOUT_MS	15000	Request timeout.

Development

npm install
npm run typecheck
npm test

The test suite mocks the PosoKanei API. It should not require live network access.

License

MIT